#tab {
  margin: 10px 20px 0px 20px;
  height: 55px;
  cursor: pointer;
  overflow-x: hidden;
  white-space: nowrap;
  display: flex;
}
#tab:hover {
  margin: 10px 20px 0px 20px;
  height: 55px;
  cursor: pointer;
  overflow-x: auto;
  white-space: nowrap;
  display: flex;
}

#aside {
  height: 100vh;
  background-color: #F2F6FC;
}

#main {
  height: 100vh;
  overflow: auto;
}

/*滚动条的宽度*/
::-webkit-scrollbar {
  width: 9px;
  height: 9px;
}

/*外层轨道。可以用display:none让其不显示，也可以添加背景图片，颜色改变显示效果*/
::-webkit-scrollbar-track {
  width: 6px;
  background-color: #ffffff;
  -webkit-border-radius: 2em;
  -moz-border-radius: 2em;
  border-radius: 2em;
}

/*滚动条的设置*/

::-webkit-scrollbar-thumb {
  background-color: #f56c6c;
  background-clip: padding-box;
  min-height: 1px;
  -webkit-border-radius: 2em;
  -moz-border-radius: 2em;
  border-radius: 2em;
}

/*滚动条移上去的背景*/

::-webkit-scrollbar-thumb:hover {
  background-color:#f56c6cb2;
}